Question

question 4 of 10
which best describes how a vaccine works?
a. the vaccine cells kill bacteria.
b. the vaccine makes the body create memory cells.
c. the vaccine produces white blood cells.
d. the vaccine causes a nonspecific immune response.

Explanation:

Vaccines introduce antigens (weakened or inactivated pathogens). The immune system recognizes these antigens. It then produces antibodies and memory cells. Memory cells "remember" the pathogen. If the actual pathogen later infects the body, memory cells quickly trigger a strong immune response. Option A is wrong as vaccines don't have cells that kill bacteria. Option C is incorrect because the body itself (not the vaccine) produces white - blood cells. Option D is wrong as vaccines cause a specific (not non - specific) immune response (targeting the specific pathogen in the vaccine).

Answer:

B. The vaccine makes the body create memory cells.